Ultra-light, multifunctional sound-insulating kit

ABSTRACT

A kit for reducing noise in motor vehicles having at least one areal vehicle part, the kit having a sound-insulating assembly package having several layers and an at least partly interlaying air layer. This assembly package has at least one porous cushioning layer, a microporous reinforcing layer which is lightweight, stiff and openly porous, an air flow resistance between R t  =500 Nsm -3  and R t  =2,500 Nsm -3 , and a surface area of mF=0.3 kg/m 2  to mF=2.0 kg/m 2 . The reinforcing layer has a stiffness of B=0.05 Nm to B=10.5 Nm. This permits replacing the weight of classic spring-mass-systems for noise reduction in vehicles with a system at least 50% lighter. In addition to the dampening effect on oscillations, this kit absorbs sound and provides thermal insulation. Preferably, this multifunctional, ultralight kit is used to insulate the floor or firewall, or as a door lining or roof inner lining.

The present invention relates to a multifunctional kit for the noisereduction and heat insulation in vehicles, according to the preamble ofclaim 1.

Large areal vehicle parts, such as floor sheeting, roof sheeting, bootlids, end faces or doors and side coverings tend to deform, vibrate andoscillate on travelling on account of their low inherent stability. Thisbehaviour is conventionally counteracted by mounting damping material,in particular of heavy layers of bitumen. In order to reduce thetransmission of travelling noises in the inside of the vehicle, in theautomobile industry, since a long time, additionally, multi-layeredsound insulation assemblies have been applied. In particular by way ofthese sound insulation assemblies, noises from the vehicle motor, fromthe gearbox and auxiliary units, from exhaust systems but also wind andtire noises are effectively insulated. These sound insulating assembliesas a rule are conceived as spring-mass-systems and all comprise anairtight heavy layer coupled to an elastic spring layer in order to dampthe vibrations of the large areal car body parts and to insulate theairborne noise.

Such a sound insulating package is for example described in EP-0'334'178and comprises essentially a soft-elastic foam material layer which facesthe car body part capable of oscillation and which acts as the spring ofthe spring-mass system, an almost compact, air-impermeable andconsolidated layer of the same material, which acts as the mass of thespring-mass-system, wherein this for consolidation is incorporated intoa frame of fleece or cut foam, as well as a decor covering or carpetlayer arranged thereabove. By way of this construction the weight of theheavy layer may be reduced up to 40% and thus also the weight of thewhole sound insulation system may be reduced with respect to the knownspring-mass-systems, but however at the cost of the acousticeffectiveness.

In EP-0'255'332 a sound insulating package is disclosed which with thehelp of a semi-flexible carrier layer, in the manner of a snap closure,is tensioned against the vehicle roof. With this carrier layer a classicspring-mass-system of a resilient, sound-absorbing foam layer and of avisco-elastic, closed-pored heavy layer (filled with bitumen) is pressedagainst the vehicle roof. By way of the non-positive connection of theheavy layer to the vehicle roof the vibrations of this are damped betterand the heavy layer no longer needs to cover the whole surface.

Generally spring-mass arrangements however lead to the onset ofresonance in the sound insulation, which usually lie in the frequencyrange of the lower motor arrangements and here are particularlyundesirable. This phenomenon as a rule forbids an extremely lightconstruction.

It is the general desire of the automobile industry to reduce the weightof vehicles. This has the result that increasingly also thinner andlighter car body parts are applied, which leads to considerable acousticdisadvantages. The demands on the sound insulation assemblies aresignificantly increased by the use of lightweight car body parts.

It is therefore the object of the invention to provide an ultra-lightkit which also with lightweight car body parts, for example of aluminiumor plastic, has no loss of acoustic effectiveness.

In particular a sound-insulating kit is to be provided which is morethan 50% lighter than conventional sound-insulating assemblies andfurthermore has good heat-insulating properties.

According to the invention this object is generally achieved by a kitwith the features of claim 1 and is particularly achieved in that theair-impermeable heavy layer with conventional spring-mass systems isreplaced by a relatively thin, micro-porous and stiff fibre layer, orfibre/foam composite layer. This micro-porous fibre layer is open-poredand has a relatively high airflow resistance. Essential for the solutionof the object set is the formation of an air layer in thesound-absorbing kit, the air layer preferably lying between the arealcar body part and the other layers. As a result basically the weight ofthe insulating mechanism with conventional spring-mass-systems isreduced in favour of an improved sound absorption. The effectiveness ofthe kit according to the invention thus involves an optimal combinationof sound insulation and absorption. The considerable increase of theabsorption coefficients achieved according to the invention leads to thefact that this kit has an extremely light construction and also withlightweight car body parts have no reduction in the acousticeffectiveness. Furthermore with the kit according to the inventionsurprisingly it has been found that there is also a considerableimprovement of the insulation in the region of the normally occuringonset of resonance.

In a first embodiment form the multi-functional kit according to theinvention comprises essentially a soft-elastic, open-pored, spring layerfacing the car body part capable of oscillation, this layer consistingof foam or fibre fleece, a microporous and light stiffening layer, inparticular a stiffly pressed fibre layer or fibre/foam composite layer,as well as a porous cover layer or carpet or protective layer arrangedthereover. All these layers may be connected to one another to acomposite part mechanically (stitched), or by partial air-permeableadhesings. In a further formation of this embodiment form the kitaccording to the invention on the car body side comprises a lightdamping layer which is applied in a partial or complete-surfaced manner,which preferably has a surface pattern according to patent EP 0 474 593and is applied onto the car body sheeting. In flat regions of the carbody a light "constrained-layer" damping of ultra-light bitumen and of atension resistant foil of aluminium or fibre-reinforced plastic papermay be applied. This is conventionally adhesed to the plating.

Further preferred embodiment forms are specified in the dependent claimsof the present application.

By way of the acoustic optimisation of the soft-elastic, open-poredlayer combined with the likewise open-pored, microporous fibre layer orfibre/foam composite layer arranged thereover, one obtains a) a soundinsulation without the onset of resonance, b) a sound absorption on thedecor or carpet side, which is already effective in the low frequencyregion, c) a heat insulation which is advantageous with vehicles with avery low fuel consumption and d) a considerable reduction in weight ofmore than 50% in comparison to the classic spring-mass construction withvehicles with a steel car body, and with a simultaneously improvedacoustic overall effectiveness.

Subsequently the invention is explained in more detail by way of a fewembodiment examples and with the help of figures. With this there areshown:

FIG. 1: a classic construction of a floor group;

FIG. 2: the course of the absorption coefficients as a function of thefrequency for the floor group according to FIG. 1;

FIG. 3: the course of the insulation as a function of the frequency forthe floor group according to FIG. 1;

FIG. 4: the principle construction of the kit according to theinvention;

FIG. 5: a kit according to the invention for the floor insulation orinner end wall covering;

FIG. 6: the course of the absorption coefficient as a function of thefrequency for the kit according to FIG. 5;

FIG. 7: the course of the insulation as a function of the frequency forthe kit according to FIG. 5;

FIG. 8: a construction through a roof inner covering according to theinvention;

FIG. 9: a construction through a dooor covering according to theinvention;

FIG. 10: a construction through an adhesed outer end wall according tothe invention;

FIG. 11: a construction through an applied outer end wall according tothe invention;

The conventional floor group 1 shown in FIG. 1 comprises a soundinsulating package 2 constructed of several layers, which is fastened ona flat, i.e. areal car body part 3. With conventional vehicles this carbody part is manufactured of an approximately 0.8 mm thick steelsheeting, which has an area-weight of approx. 6.32 kg/m². On this carbody part 3 there is mounted a damping layer 4, as a rule an approx. 2.2mm thick bitumen-layer, with approx. 3.5 kg/m² surface weight. With thisdamping layer 4 essentially high frequeny oscillations are damped. Ontothis damping layer as a rule a spring-mass system is loosely applied sothat between the damping layer 4 and the spring-mass system there arisesan approx. 0.2 mm thick air layer 5. The spring-mass system comprises anapprox. 15 mm thick fibre layer 6 with a spacial weight of approx. 70kg/m³ or an area-weight of appprox. 1.05 kg/m². Insead of this fibrelayer 6 also similarly heavy elastic foam layers are used. Connected tothis is an approx. 2 mm thick, air-impermeable heavy layer 7 with anarea-weight of approx. 4.0 kg/m² on which in turn there is deposited forexample an approx. 5.0 mm thick carpet 8 of approx. 0.6 kg/m² surfaceweight. This classic floor group thus comprises a total surface weightof approx. 15.47 kg/m² of which the area-weight of the sound insulationpackage 2 constitutes a part of approx. 9.15 kg/m².

The curve 9 represented in FIG. 2 shows the behaviour of the absorptioncoefficients as a function of the frequency of this floor group 1. Fromthis it can be clearly recognised that this sound insulation package inthe region of 200 Hz comprises a marked resonance absorption, and in theregion above 500 Hz shows a clearly worse absorption which with anincreasing frequency improves slightly. This slightly increasingabsorption is only caused by the properties of the carpet.

The frequency course 10 of the insulation, which is represented in FIG.3 and belongs to this floor group 1 clearly illustrates the insulationof the high frequency sound, and shows an onset of insulation in theregion of 200 Hz which is characteristic for all spring-mass systems.

With the use of approx. 1.1 mm thick aluminium sheeting instead of theapprox. 0.8 mm thick steel sheeting as a car body part 3 with theseconventional insulation systems the complete insulation is worsened byapprox. 6 dB and the onset of resonance of the insulation and theresonance absorption are displaced to somewhat higher frequencies in theregion about 250 Hz. This is as a result of the halving in mass with theuse of aluminium instead of steel.

The principle construction of the kit 41 according to the inventionshown in FIG. 4 comprises essentially an areal vehicle part 11 and anassembly package 42 bearing thereon. This assembly package 42 comprisesseveral layers and by necessity a porous spring layer 13 and amicroporous stiffening layer 14. The porous spring layer 13 ispreferably formed from an open-pored foam layer. The microporousstiffening layer consists preferably of an open-pored fibre layer orfibre/foam composite layer which has a total airflow resistance of R_(t)=500 Nsm⁻³ to R_(t) =2500 Nsm⁻³, in particular from R_(t) =900 Nsm⁻³ toR_(t) =2000 Nsm⁻³, and an areal-mass of m_(F) =0.3 kg/m² to m_(F) =2.0kg/m², in particular of m_(F) =0.5 kg/m³ to m_(F) =1.6 kg/m². Forhelping, further layers 21 and 23 may be deposited. Essential to theacoustic effectiveness of the multifunctional kit 41 is an air layer 25between the assembly package 42 and the areal vehicle part 11. In orderto further improve this acoustic effectiveness the microporousstiffening layer 14 has a bending stiffness of B=0.005 Nm to B=10.5 Nm,in particular from B=0.025 Nm to B=6.0 Nm.

The ultralight kit according to the invention, according to FIG. 5 isparticularly suitable for the construction of a floor insulation or theinner end wall covering. It comprises an approx. 1.1 mm thick aluminiumcar body part 11, on which there is applied a light damping layer 12,for example an SDL damping layer, whilst forming an air layer 25. SuchSDL damping layers are known and as a rule have a surface patternaccording to the patent EP 0 474 593 and a special bitumenous materialcomposition. These are applied with the pattern onto the sheeting andare rigidly connected to the soft foam system. The effective density ofthis damping layer 12 is ρ=1100 kg/m³. In the present embodiment examplean approx. 2.0 mm thick damping layer with an area-weight of approx. 2.4kg/m² is used. Onto this there is applied an approx. 25 mm thick layerof moulded foam 13 with a spacial weight of approx. 20 kg/m³, or with anarea-weight of approx. 0.4 kg/m² to 1.75 kg/m². This moulded foam layer13 is in particular a thermomoulded foam layer and is open-pored and isconnected to an approx. 1.5 mm to 5.0 mm thick microporous, stiff fibrelayer 14 of approx. 0.6 kg/m² to 1.6 kg/m² surface weight. Suitable as adamping layer are also ultra-light, bitumenous damping layers of severallayers, which for example comprise an aluminium foil or fibre-reinforcedplastic paper or bitumen-free damping materials, for example EPDM ormoulded foam with an effective spacial weight of approx. 40 kg/m³. Themicroporous fibre layer 14 is of the type such that this has a totalairflow resistance of R_(t) =500 Nsm⁻³ to R_(t) =2500 Nsm⁻³, inparticular from R_(t) =900 Nsm⁻³ to R_(t) =2000 Nsm⁻³, and an areal-massof m_(F) =0.3 kg/m² to m_(F) =2.0 kg/m², in particular of m_(F) =0.5kg/m² to m_(F) =1.6 kg/m² and a bending stiffness of B=0.005 Nm toB=10.5 Nm, in particular of B=0.025 Nm to B=6.0 Nm. This microporosityand stiffness are essential for the absorption capability of the wholeassembly package and may be achieved by way of a suitable choice ofvarious materials. With the application as floor insulation a carpet ordecor layer 15 is connected to this microporous, stiff fibre layer 15 onthe side of the vehicle passenger space and in this embodiment examplehas a thickness of approx. 5 mm or an area-weight of approx. 0.6 kg/m².The assembly package 42 according to the invention thus weighs onlyapprox. 4.1 kg/m² and permits the weight of the complete floor group tobe reduced from approx. 15.47 kg/m² to approx. 7.07 kg/m². With theapplication of this kit 41 as an inner end wall, the decor layer orcarpet layer may be done away with.

The frequency dependent course 16 of the absorption coefficients shownin FIG. 6 clearly illustrates the special frequency course for the kit41 according to the invention with an approx. 1.1 mm thick aluminiumsheeting: perfect sound absorption in the middle frequency range andconstant, not too large an absorption of α=0.7 to α=0.8 in the highfrequency range. This is necessary for maintaining the ability tounderstand conversation in the vehicle.

The course 17 of the frequency dependent insulation of the kit 41according to the invention, which can be deduced from FIG. 7 clearly nolonger shows any onset of resonance, as occurs as a matter of coursewith the conventional spring-mass-systems in the region of 200 Hz.

A further application of the kit 41 according to the invention for theinsulation of a roof inner covering (sky roof) is shown in FIG. 8. Thiscomprises an approx. 2 mm thick carrier layer 26 of a highly pressedfibre material with an area-weight of approx. 0.5 kg/m². As a subsequentlayer there is an approx. 15 mm thick foam layer 13 with a spacialweight of approx. 20 kg/m³. This foam or moulded foam layer according tothe invention carries a stiffening layer 14, in particular a microporousfibre layer of approx. 1.5 mm thickness and approx. 0.4 kg/m³ surfaceweight. A porous, in particular open-pored, soft decor layer 23 ofapprox. 2 mm thickness or approx. 0.21 kg/m² surface weight closes thissound absorbing and oscillation damping, self supporting sky roofdesign. This multifunctional kit according to the invention thuscomprises a complete thickness of approx. 24.5 mm and a complete surfaceweight of approx. 1.56 kg/m² and acts in the same manner as thepreviously described embodiment example. Further embodiment forms forthe construction of a roof inner covering according to the invention aredefined in more detail in the dependent claims 21 to 24.

It is to be understood that this roof inner covering may also beprovided with a damping layer, in particular with an approx. 4 mm thickfoam damping with a surface pattern according to EP 0 474 593 and withan area-weight of approx. 0.15 kg/m².

In an alternative embodiment form of this roof inner covering thecarrier layer 26 may be left out and the assembly package 42, whilstforming an air layer 25, is directly adhesed to the areal vehicle part11. By way of this, although the oscillation damping of the aluminiumroof is reduced and the sound insulation, in particular with rain ortunnel journeys, is somewhat reduced, however with this still asufficiently effective kit according to the invention with a thicknessof approx. 18.5 mm and an area-weight of approx. 0.91 kg/m² may berealised.

The kit 41 according to the invention may also be applied to doorcoverings and comprises in one embodiment form according to FIG. 9 anapprox. 2.4 mm thick, multi-layered damping layer which consists of anultra-light bitumenous damping material and at least on approx. 0.1 mmthin aluminium foil. Such multi-layered damping systems directly adhesedto the sheeting are known. They are however as a rule at least 4 kg/m²heavy. The applied system according to the invention has an area-weightof still only approx. 2.67 kg/m² with a better damping efficiency thanconventional systems. Subsequently there follows an air gap 25 of avariable thickness. This may in particular be used in order toaccommodate the mechanics of the window. The actual assembly package 42is protected against damp and contamination by a 25 μm thin PU-foil 27with an area-weight of approx. 0.03 kg/m². The porous spring layer 13and the microporous stiffening layer 14 are formed according to thefeatures of claims 26 to 29. This layer sequence is closed on thepassenger space side by an approx. 2 mm thick porous cover layer 23, inparticular an open-pored decor layer, with an area-weight of approx.0.21 kg/m². Thus this assembly package comprises an area-weight ofapprox. 3.51 kg/m². It is to be understood that this assembly package 42may only be mounted partially and preferably only in the areal regionsof the door.

It is to be understood that this kit 41 may also be provided with adamping layer 12 between the areal vehicle part 11, this consistingeither of multi-layered, approx. 2.3 mm thick ultra-light dampingmaterial with an area-weight of approx. 2.67 kg/m² and with at leastone, approx. 0.1 mm thin aluminium foil, or of a multi-layered, approx.2.3 mm thick, ultra-light damping material with an area-weight ofapprox. 2.67 kg/m² and with at least one approx. 0.1 mm thin foil offibre reinforced plastic paper. Thus the area-weight of themulti-layered damping layer is approx. 2.54 kg/m².

The kit 41 according to the invention may also be applied as the outerend wall covering, as is shown in FIGS. 10 and 11. The assembly packageused for this comprises on the side of the motor space a dirt-resistantprotective layer 28, in particular an oil and water resistant protectivefleece. The microporous stiffening layer 14 is arranged between thespring layer 13 and this protective layer, wherein the stiffening layerconsists of a highly pressed fibre material with a thickness of approx.2.5 mm and an area-weight of approx. 1.0 kg/m², the open-pored springlayer of the assembly package 42 either consisting of an approx. 15 mmthick thermomoulded foam with an area-weight of approx. 0.3 kg/m², or ofan approx. 15 mm thick PU moulded foam with an area-weight of approx.0.6 kg/m² to 0.9 kg/m², or of an approx. 15 mm thick duroplastic mixedfibre fleece of heat resistant fibres and with an area-weight of approx.0.7 kg/m² to 1.0 kg/m². The protective layer on the motor space sidecomprises a thickness of 0.2 to 0.4 mm and an area-weight of 0.1 to 0.3kg/m². With this embodiment form the assembly package 42 is adhesed in asimple manner to the areal vehicle part 11 whilst forming an air layer25.

In one further embodiment form of this assembly package 42 used as anouter end wall covering, as is shown in FIG. 11, the microporousstiffening layer 14 lies between the porous spring layer 13 and the airlayer 25. Again the open-pored spring layer of the assembly package mayconsist of a thermomoulded foam, of a PU moulded foam or of aduroplastic mixed fibre fleece, and on the motor space side is providedwith a protective layer 28. This assembly package 42 may be adhesed tothe areal vehicle part 11 or only layed on. In order to lay on theassembly package in a stable manner, this comprises a carrier layer 26.It is to be understood that with these embodiment forms between theassembly package 42 and the air layer 25 there may also be provided afoam damping, which comprises a thickness of 3 mm and an area-weight ofapprox. 0.12 kg/m².

The advantages of the kit according to the invention are particularlyevident with the application of thin steel sheeting or light aluminiumsheeting or organo-sheeting, as is favourably used today in theautomobile industry. A further advantage of the kit according to theinvention lies in the extremely low heat conductability of the appliedporous spring layer, which leads to the fact that this kit apart fromits good acoustic effectiveness also has a good heat insulation.

What is claimed is:
 1. A multi-functional insulation for use invehicles, which is sound-absorbing, sound-insulating,oscillation-damping and heat-insulating, for use as a floor insulation,an end wall insulation, a door covering, or a roof inner covering, incombination with at least one sheet-like vehicle part and having anoise-reducing assembly package of several layers, the assembly packagecomprising:at least one porous resilient layer; a microporous stiffeninglayer which has a total airflow resistance of R_(t) =500 Nsm⁻³ to R_(t)=2500 Nsm⁻³, and an areal-mass of m_(F) =0.3 kg/m² to m_(F) =2.0 kg/m² ;wherein between the assembly package and the sheet-like vehicle partthere is provided an air layer; and wherein said multi-layered assemblypackage is a heavy-layer free package.
 2. The multi-functionalinsulation according to claim 1 wherein the microporous stiffening layerhas a bending stiffness of B=0.005 Nm to B=10.5 Nm.
 3. Themulti-functional insulation according to claim 1 wherein the assemblypackage further comprises a porous cover layer selected from the groupcomprising: a soft decor layer, a carpet layer, or a dirt-resistantprotective fleece.
 4. The multi-functional insulation according to claim1 wherein the at least one porous resilient layer is disposed betweenthe air layer and the microporous stiffening layer.
 5. Themulti-functional insulation according to claim 1 wherein the porousresilient layer comprises a thermomoulded foam with a density of ρ≦30kg/m³.
 6. The multi-functional insulation according to claim 1 whereinthe porous resilient layer comprises a PU moulded foam with a density ofρ≦70 kg/m³.
 7. The multi-functional insulation according to claim 1wherein the porous resilient layer comprises a thermoplastic mixed fibrefleece with a density of ρ≦70 kg/m³.
 8. The multi-functional insulationaccording to claim 1 wherein the porous resilient layer comprises aduroplastic fibre fleece with a density of ρ≦70 kg/m³.
 9. Themulti-functional insulation according to claim 5, further comprising adamping layer, at least a portion of which is disposed between theassembly package and the sheet-like vehicle part.
 10. Themulti-functional insulation according to claim 9, wherein the dampinglayer has a thickness of about 2.2 mm and comprises an ultra-lightdamping material with an area-weight of about 2.4 kg/m², wherein:thedamping layer is adhesed onto the sheet-like vehicle part; the airlayer, formed between the assembly package and the damping layer by arelief-like support of the assembly package has a thickness of about 0.2mm.
 11. The multi-functional insulation according to claim 9, whereinthe damping layer comprises a multi-layered, ultra-light dampingmaterial comprising:at least an about 0.2 mm thin aluminum foil andhaving an area-weight of about 2.94 kg/m² ; wherein the damping layer isadhesed onto the sheet-like vehicle part; the air layer, formed betweenthe assembly package and the damping layer by a relief-like support ofthe assembly package, has a thickness of about 0.2 mm.
 12. Themulti-functional insulation according to claim 9, wherein the dampinglayer comprises a multi-layered, ultra-light damping materialcomprising:at least an about 0.2 mm thin fibre-reinforced plastic paperand having an area-weight of about 2.67 kg/m² ; whereinthe damping layeris adhesed onto the sheet-like vehicle part; the air layer, formedbetween the assembly package and the damping layer by a relief-likesupport of the assembly package, has a thickness of about 0.2 mm. 13.The multi-functional insulation according to claim 9, wherein thedamping layer has a thickness of about 2.0 mm and comprises anultra-light EPDM damping material with an area-weight of about 2.4 kg/m²and a relief-like structured surface; whereinthe damping layer has afirst side and a second side, said first side lies with the relief-likestructured surface on the sheet-like vehicle part so that the air layer,formed between the relief-like structured surface of the damping layerand the sheet-like vehicle part, at least in regions, has a thickness ofabout 0.2 mm, and said second side is fastened to the porous resilientlayer.
 14. The multi-functional insulation according to claim 9, whereinthe damping layer comprises an about 4 mm thin moulded foam layer withan effective spacial weight of about 40 kg/m³ or an area-weight of about0.2 kg/m² and having a relief-like structured surface; whereinthedamping layer has a first side and a second side, said first side lieswith the relief-like structured surface on the sheet-like vehicle partso that the air layer, formed between the relief-like structured surfaceof the damping layer and the sheet-like vehicle part, at least inregions, has a thickness of about 0.2 mm, and said second side isfastened to the porous resilient layer.
 15. The multi-functionalinsulation according to claim 5 wherein, when used for the floorinsulation, the assembly package comprises a decor layer of about 5 mmthickness and an area-weight of 0.4 kg/m² to 1.0 kg/m².
 16. Themulti-functional insulation according to claim 5, wherein, when used forthe end wall insulation, the assembly package further comprises a decorlayer of about 5 mm thickness and an area-weight of 0.4 kg/m² to 1.0kg/m².
 17. The multi-functional insulation according to claim 1 wherein,when used for the roof inner covering, the assembly package comprises arelief-like structured surface which, while forming an air layer, isadhesed to the sheet-like vehicle part; andthe porous resilient layercomprises a stiff thermomoulded foam layer with a compression modulus ofmore than 120,000 Pa, with a thickness of about 13 mm to 17 mm and withan area-weight of 0.2 kg/m² to 0.4 kg/m² ; and the microporousstiffening layer has a thickness of 1.5 mm to 2.0 mm and an area-weightof 0.4 kg/m² to 0.6 kg/m² ; and further comprisinga porous decor layerhaving a thickness of about 2 mm and an area-weight of about 0.21 kg/m².18. The multi-functional insulation according to claim 1 wherein, whenused for the roof inner covering, the assembly package comprises arelief-like structured surface which, while forming an air layer, isadhesed to the sheet-like vehicle part; andthe porous resilient layercomprises an open-pored soft PU moulded foam layer with a compressionmodulus of less than 60 kPa, with a thickness of about 20 mm and with anarea-weight of 0.8 kg/m² ; and the microporous stiffening layer has athickness of 1.5 mm to 2.0 mm and an area-weight of 0.4 kg/m² to 0.6kg/m² ; and further comprisinga porous decor layer having a thickness ofabout 2 mm and an area-weight of about 0.21 kg/m².
 19. Themulti-functional insulation according to claim 1 wherein, when used forthe roof inner covering, the assembly package comprises a relief-likestructured surface which, while forming an air layer, is adhesed to thesheet-like vehicle part; andthe porous resilient layer comprises athermoplastic mixed fibre fleece with a density of less than 35 kg/m³,with a thickness of about 20 mm and with an area-weight of 0.7 kg/m² ;and the microporous stiffening layer has a thickness of 1.5 mm to 2.0 mmand an area-weight of 0.4 kg/m² to 0.6 kg/m² ; and further comprisingaporous decor layer having a thickness of about 2 mm and an area-weightof about 0.21 kg/m².
 20. The multi-functional insulation according toclaim 1 wherein, when used for the roof inner covering, the assemblypackage comprises a relief-like structured surface which, while formingan air layer is adhesed to the sheet-like vehicle part; andthe porousresilient layer comprises a duroplastic mixed fibre fleece with adensity of less than 50 kg/m³, with a thickness of about 20 mm and withan area-weight of 1.0 kg/m² ; and the microporous stiffening layer has athickness of 1.5 mm to 2.0 mm and an area-weight of 0.4 kg/m² to 0.6kg/m² ; and further comprising a porous decor layer having a thicknessof about 2 mm and an area-weight of about 0.21 kg/m².
 21. Themulti-functional insulation according to claim 1 wherein, when used forthe roof inner covering, the assembly package comprises a relief-likestructured surface which, while forming an air layer, bears against thesheet-like vehicle part, the assembly package additionally comprising:anopen-pored, stiff carrier layer; and the porous resilient layercomprises a stiff thermomoulded foam layer with a compression modulus ofmore than 120,000 Pa, with a thickness of about 13 mm to 17 mm and withan area-weight of 0.2 kg/m² to 0.4 kg/m² ; and the microporousstiffening layer has a thickness of 1.5 mm to 2.0 mm and an area-weightof 0.4 kg/m² to 0.6 kg/m² ; and further comprising a porous decor layerhaving a thickness of about 2 mm and an area-weight of about 0.21 kg/m².22. The multi-functional insulation according to claim 1 wherein, whenused for the roof inner covering, the assembly package comprises arelief-like structured surface which, while forming an air layer, bearsagainst the sheet-like vehicle part, and additionally comprising:anopen-pored, stiff carrier layer; the porous resilient layer comprisingan open-pored soft PU moulded foam layer with a compression modulus ofless than 60 kPa, with a thickness of about 20 mm and an area-weight ofabout 0.8 kg/m² ; and the microporous stiffening layer has a thicknessof 1.5 mm to 2.0 mm and an area-weight of 0.4 kg/m² to 0.6 kg/m² ; andfurther comprisinga porous decor layer having a thickness of about 2 mmand an area-weight of about 0.21 kg/m².
 23. The multi-functionalinsulation according to claim 1 wherein, when used for the roof innercovering, the assembly package comprises a relief-like structuredsurface which, while forming an air layer, bears against the sheet-likevehicle part, and additionally comprising:an open-pored, stiff carrierlayer; and the porous resilient layer comprises a thermoplastic mixedfibre fleece with a density of less than 35 kg/m³, with a thickness ofabout 20 mm and with an area-weight of about 0.7 kg/m² ; and themicroporous stiffening layer has a thickness of 1.5 mm to 2.0 mm and anarea-weight of 0.4 kg/m² to 0.6 kg/m² ; and further comprisinga porousdecor layer having a thickness of about 2 mm and an area-weight of about0.21 kg/m².
 24. The multi-functional insulation according to claim 1wherein, when used for the roof inner covering, the assembly packagecomprises a relief-like structured surface which, while forming an airlayer, bears against the sheet-like vehicle part, and additionallycomprises:an open-pored, stiff carrier layer; and the porous resilientlayer comprises a duroplastic mixed fibre fleece with a density of lessthan 50 kg/m³, with a thickness of about 20 mm and with an area-weightof about 1.0 kg/m² ; and the microporous stiffening layer has athickness of 1.5 mm to 2.0 mm and an area-weight of 0.4 kg/m² to 0.6kg/m² ; and further comprising a porous decor layer having a thicknessof about 2 mm and an area-weight of about 0.21 kg/m².
 25. Themulti-functional insulation according to claim 21 wherein, when used forthe roof inner covering, between the assembly package and the sheet-likevehicle part, at least partially, there is disposed a damping layerwhich comprises a moulded foam with a thickness of about 4 mm and anarea-weight of about 0.2 kg/m².
 26. The multi-functional insulationaccording to claim 1 wherein, when used for the door covering an about25 μmm thin PU foil with about 0.003 kg/m² surface weight is providedbetween the air layer and the assembly package;the porous resilientlayer comprising an about 15 mm thick thermomoulded foam with anarea-weight of about 0.3 kg/m².
 27. The multi-functional insulationaccording to claim 1 wherein, when used for the door covering, an about25 μm thin PU foil with about 0.003 kg/m² surface weight is providedbetween the air layer and the assembly package;the porous resilientlayer comprising an about 15 mm thick moulded foam layer with anarea-weight of about 0.6 kg/m² to 0.9 kg/m².
 28. The multi-functionalinsulation according to claim 1 wherein, when used for the doorcovering, an about 25 μm thin PU foil with about 0.003 kg/m² surfaceweight is provided between the air layer and the assembly package;theporous resilient layer comprising an about 15 mm thick thermoplasticmixed fibre fleece with a density of less than about 35 kg/m³ and anarea-weight of about 0.5 kg/m².
 29. The multi-functional insulationaccording to claim 1 wherein, when used for the door covering, an about25 μm thin PU foil with about 0.003 kg/m² surface weight is providedbetween the air layer and the assembly package;the porous resilientlayer comprising an about 15 mm thick duroplastic mixed fibre fleecewith a density of less than about 50 kg/m³ and an area-weight of about0.75 kg/m².
 30. The multi-functional insulation according to claim 26,wherein the sheet-like vehicle part, at least partially, is providedwith a damping layer, which comprises a multi-layered, about 2.3 mmthick ultra-light damping material, with an area-weight of about 2.67kg/m² and with at least an about 0.1 mm thin aluminum foil.
 31. Themulti-functional insulation according to claim 26, wherein thesheet-like vehicle part, at least partially, is provided with a dampinglayer, which comprises a multi-layered, about 2.3 mm thick ultra-lightdamping material, with an area-weight of about 2.67 kg/m² and with atleast an about 0.1 mm thin foil of fibre-reinforced plastic paper,wherein the area-weight of the multi-layered damping layer is about 2.54kg/m².
 32. The multi-functional insulation according to claim 1wherein:the porous resilient layer further comprises a 15 mm thickthermomoulded foam with an area-weight of about 0.3 kg/m².
 33. Themulti-functional insulation according to claim 1 wherein:the porousresilient layer further comprises an about 15 mm thick PU moulded foamwith an area-weight of about 0.6 kg/m² to 0.9 kg/m².
 34. Themulti-functional insulation according to claim 1 wherein:the porousresilient layer further comprises an about 15 mm thick duroplastic mixedfibre fleece of heat-resistant fibres and with an area-weight of about0.7 kg/m² to 1.0 kg/m².
 35. The multi-functional insulation according toclaim 32 wherein a dirt-resistant protective fleece is provided betweenthe air layer and the assembly package, said dirt-resistant protectivefleece having an area-weight of 0.05 kg/m² to 0.15 kg/m².
 36. Themulti-functional insulation according to claim 1, wherein themicroporous stiffening layer is disposed between the porous resilientlayer and the air layer.
 37. The multi-functional insulation accordingto claim 36 wherein, when used for the end wall insulation of a motorspace side;the microporous stiffening layer comprises a highly pressedfibre material with a thickness of about 2.5 mm and an area-weight ofabout 1.0 kg/m² ; the porous resilient layer comprises an about 15 mmthick thermomoulded foam with an area-weight of about 0.3 kg/m² ; andfurther comprising a dirt-resistant protective layer on the motor spaceside with a thickness of 0.2 to 0.4 mm and an area-weight of 0.1 to 0.3kg/m².
 38. The multi-functional insulation according to claim 36wherein, when used for the end wall insulation of a motor space side;themicroporous stiffening layer comprises a highly pressed fibre materialwith a thickness of about 2.5 mm and an area-weight of about 1.0 kg/m² ;the porous resilient layer comprises an about 15 mm thick PU mouldedfoam with an area-weight of about 0.6 kg/m² to 0.9 kg/m² ; and furthercomprising a dirt-resistant protective layer on the motor space sidewith a thickness of 0.2 to 0.4 mm and an area-weight of 0.1 to 0.3kg/m².
 39. The multi-functional insulation according to claim 36wherein, when used for the end wall insulation of a motor space side;themicroporous stiffening layer comprises a highly pressed fibre materialwith a thickness of about 2.5 mm and an area-weight of about 1.0 kg/m² ;the porous resilient layer comprises an about 15 mm thick duroplasticmixed fibre fleece of heat-resistant fibres with an area-weight of about0.7 kg/m² to 1.0 kg/m² ; and further comprising a dirt-resistantprotective layer on the motor space side with a thickness of 0.2 to 0.4mm and an area-weight of 0.1 to 0.3 kg/m².
 40. The multi-functionalinsulation according to claim 32 wherein, between the air layer and theassembly package a foam damping layer having a thickness of 3.0 mm andan area-weight of about 0.12 kg/m² is provided.
 41. The multi-functionalinsulation according to claim 1 wherein the sheet-like vehicle part isan about 0.8 mm thick steel sheeting.
 42. The multi-functionalinsulation according to claim 1 wherein the sheet-like vehicle part isan about 1.1 mm thick aluminum sheeting.
 43. The multi-functionalinsulation according to claim 1 wherein the sheet-like vehicle part isan about 1.5 mm thick fibre-reinforced plastic part.
 44. Themulti-functional insulation according to claim 1 wherein the porousresilient layer has a heat conductability λ of less than 0.05 W/mK. 45.A multi-layered assembly package for a multi-functional insulation foruse in vehicles, which is sound-absorbing, sound-insulating,oscillation-damping and heat-insulating, said multi-layered assemblypackage having several layers, the assembly package comprising: amicroporous stiffening layer which has a total airflow resistance ofR_(t) =500 Nsm⁻³ to R_(t) =2500 Nsm⁻³, and an areal-mass of m_(F) =0.3kg/m² to m_(F) =2.0 kg/m², and wherein said multi-layered assemblypackage is a heavy-layer free package.
 46. The multi-layered assemblypackage according to claim 45, wherein the microporous stiffening layerhas a bending stiffness of B=0.005 Nm to B=10.5 Nm.
 47. Themulti-layered assembly package according to claim 45, wherein theassembly package further comprises a layer selected from the groupcomprising a damping layer and an adhesive layer.
 48. Themulti-functional insulation according to claim 10 wherein, when used forthe floor insulation, the assembly package further comprises a decorlayer of about 5 mm thickness and an area-weight of 0.4 kg/m² to 1.0kg/m².
 49. The multi-functional insulation according to claim 10wherein, when used for the end wall insulation, the assembly packagefurther comprises a decor layer of about 5 mm thickness and anarea-weight of 0.4 kg/m² to 1.0 kg/m².
 50. The multi-functionalinsulation according to claim 37, wherein a foam damping having athickness of 3.0 mm and an area-weight of about 0.12 kg/m² is providedbetween the air layer and the assembly package.
 51. The multi-functionalinsulation according to claim 1 wherein the porous resilient layercomprises an open-pored foam layer.
 52. The multi-functional insulationaccording to claim 1 wherein the microporous stiffening layer comprisesa layer selected from the group comprising an open-pored fibre layer anda fibre/foam composite layer.
 53. The multi-functional insulationaccording to claim 1 wherein the microporous stiffening layer has atotal airflow resistance of R_(t) =900 Nsm⁻³ to R_(t) =2000 Nsm⁻³, andan areal-mass of m_(F) =0.5 kg/m² to m_(F) =1.6 kg/m².
 54. Themulti-functional insulation according to claim 2 wherein the microporousstiffening layer has a bending stiffness of B=0.025 Nm to B=6.0 Nm. 55.The multi-functional insulation according to claim 5 wherein thethermomoulded foam has a density of ρ≦15 kg/m³.
 56. The multi-functionalinsulation according to claim 6 wherein the PU moulded foam has adensity of ρ≦45 kg/m³.
 57. The multi-functional insulation according toclaim 7 wherein the thermoplastic mixed fibre fleece has a density ofρ≦35 kg/m³.
 58. The multi-functional insulation according to claim 8wherein the duroplastic fibre fleece has a density of ρ≦50 kg/m³. 59.The multi-functional insulation according to claim 13 wherein the EPDMdamping material is bitumen-free.
 60. The multi-functional insulationaccording to claim 21 wherein the open-pored, stiff carrier layer isselected from the group comprising a highly pressed, microporous fibrematerial and a honeycomb-like constructed carrier material, of about 3to 5 mm thickness and an area-weight of 0.4 to 0.6 kg/m².
 61. Themulti-functional insulation according to claim 22 wherein theopen-pored, stiff carrier layer is selected from the group comprising ahighly pressed, microporous fibre material and a honeycomb-likeconstructed carrier material, of about 3 to 5 mm thickness and anarea-weight of 0.4 to 0.6 kg/m².
 62. The multi-functional insulationaccording to claim 23 wherein the open-pored, stiff carrier layer isselected from the group comprising a highly pressed, microporous fibrematerial and a honeycomb-like constructed carrier material, of about 3to 5 mm thickness and an area-weight of 0.4 to 0.6 kg/m².
 63. Themulti-functional insulation according to claim 24 wherein theopen-pored, stiff carrier layer is selected from the group comprising ahighly pressed, microporous fibre material and a honeycomb-likeconstructed carrier material, of about 3 to 5 mm thickness and anarea-weight of 0.4 to 0.6 kg/m².
 64. The multi-functional insulationaccording to claim 32 wherein the dirt-resistant protective layerfurther comprises an oil and water resistant protective fleece.
 65. Themulti-functional insulation according to claim 33 wherein thedirt-resistant protective layer further comprises an oil and waterresistant protective fleece.
 66. The multi-functional insulationaccording to claim 34 wherein the dirt-resistant protective layerfurther comprises an oil and water resistant protective fleece.
 67. Themulti-functional insulation according to claim 35 wherein thedirt-resistant protective fleece further comprises an oil and waterresistant protective fleece.
 68. The multi-functional insulationaccording to claim 37 wherein the dirt-resistant protective layer is awater and oil resistant fibre fleece.
 69. The multi-functionalinsulation according to claim 38 wherein the dirt-resistant protectivelayer is a water and oil resistant fibre fleece.
 70. Themulti-functional insulation according to claim 39 wherein thedirt-resistant protective layer is a water and oil resistant fibrefleece.
 71. The multi-functional insulation according to claim 43,wherein the fibre-reinforced plastic part is preferably organo-sheeting.72. The multi-functional insulation according to claim 44, wherein theporous resilient layer has a heat conductability λ of preferably 0.04W/mK.
 73. The assembly package according to claim 47 wherein theassembly package further comprises a damping layer and an adhesivelayer.
 74. The multi-functional insulation according to claim 9wherein:the porous resilient layer has a thickness of about 25 mm and asurface weight of about 0.4 kg/m² to 1.75 kg/m² ; and the microporousstiffening layer has a thickness of 1.5 mm to 5.0 mm and an area-weightof 0.6 kg/m² to 1.6 kg/m².
 75. The multi-functional insulation accordingto claim 6, wherein, when used for the floor insulation, the assemblypackage comprises a decor layer of about 5 mm thickness and anarea-weight of 0.4 kg/m² to 1.0 kg/m².
 76. The multi-functionalinsulation according to claim 6, wherein, when used for the end wallinsulation, the assembly package further comprises a decor layer ofabout 5 mm thickness and an area-weight of 0.4 kg/m² to 1.0 kg/m². 77.The multi-functional insulation according to claim 7, wherein, when usedfor the floor insulation, the assembly package comprises a decor layerof about 5 mm thickness and an area-weight of 0.4 kg/m² to 1.0 kg/m².78. The multi-functional insulation according to claim 7, wherein, whenused for the end wall insulation, the assembly package further comprisesa decor layer of about 5 mm thickness and an area-weight of 0.4 kg/m² to1.0 kg/m².
 79. The multi-functional insulation according to claim 8,wherein, when used for the floor insulation, the assembly packagecomprises a decor layer of about 5 mm thickness and an area-weight of0.4 kg/m² to 1.0 kg/m².
 80. The multi-functional insulation according toclaim 8, wherein, when used for the end wall insulation, the assemblypackage further comprises a decor layer of about 5 mm thickness and anarea-weight of 0.4 kg/m² to 1.0 kg/m².
 81. The multi-functionalinsulation according to claim 9, wherein, when used for the floorinsulation, the assembly package comprises a decor layer of about 5 mmthickness and an area-weight of 0.4 kg/m² to 1.0 kg/m².
 82. Themulti-functional insulation according to claim 9, wherein, when used forthe end wall insulation, the assembly package further comprises a decorlayer of about 5 mm thickness and an area-weight of 0.4 kg/m² to 1.0kg/m².
 83. The multi-functional insulation according to claim 22wherein, when used for the roof inner covering, between the assemblypackage and the sheet-like vehicle part, at least partially, there isdisposed a damping layer which comprises a moulded foam with a thicknessof about 4 mm and an area-weight of about 0.2 kg/m².
 84. Themulti-functional insulation according to claim 23 wherein, when used forthe roof inner covering, between the assembly package and the sheet-likevehicle part, at least partially, there is disposed a damping layerwhich comprises a moulded foam with a thickness of about 4 mm and anarea-weight of about 0.2 kg/m².
 85. The multi-functional insulationaccording to claim 24 wherein, when used for the roof inner covering,between the assembly package and the sheet-like vehicle part, at leastpartially, there is disposed a damping layer which comprises a mouldedfoam with a thickness of about 4 mm and an area-weight of about 0.2kg/m².
 86. The multi-functional insulation according to claim 1whereinthe microporous stiffening layer has a thickness of about 1 mm to1.5 mm and an area-weight of about 0.5 kg/m² ; and further comprising anopen-pored decor layer having an area-weight of about 0.21 kg/m² and athickness of about 2 mm.
 87. The multi-functional insulation accordingto claim 27, wherein the sheet-like vehicle part, at least partially, isprovided with a damping layer, which comprises a multi-layered, about2.3 mm thick ultra-light damping material, with an area-weight of about2.67 kg/m² and with at least an about 0.1 mm thin aluminum foil.
 88. Themulti-functional insulation according to claim 27, wherein thesheet-like vehicle part, at least partially, is provided with a dampinglayer, which comprises a multi-layered, about 2.3 mm thick ultra-lightdamping material, with an area-weight of about 2.67 kg/m² and with atleast an about 0.1 mm thin foil of fibre-reinforced plastic paper,wherein the area-weight of the multi-layered damping layer is about 2.54kg/m².
 89. The multi-functional insulation according to claim 28,wherein the sheet-like vehicle part, at least partially, is providedwith a damping layer, which comprises a multi-layered, about 2.3 mmthick ultra-light damping material, with an area-weight of about 2.67kg/m² and with at least an about 0.1 mm thin aluminum foil.
 90. Themulti-functional insulation according to claim 28, wherein thesheet-like vehicle part, at least partially, is provided with a dampinglayer, which comprises a multi-layered, about 2.3 mm thick ultra-lightdamping material, with an area-weight of about 2.67 kg/m² and with atleast an about 0.1 mm thin foil of fibre-reinforced plastic paper,wherein the area-weight of the multi-layered damping layer is about 2.54kg/m².
 91. The multi-functional insulation according to claim 29,wherein the sheet-like vehicle part, at least partially, is providedwith a damping layer, which comprises a multi-layered, about 2.3 mmthick ultra-light damping material, with an area-weight of about 2.67kg/m² and with at least an about 0.1 mm thin aluminum foil.
 92. Themulti-functional insulation according to claim 29, wherein thesheet-like vehicle part, at least partially, is provided with a dampinglayer, which comprises a multi-layered, about 2.3 mm thick ultra-lightdamping material, with an area-weight of about 2.67 kg/m² and with atleast an about 0.1 mm thin foil of fibre-reinforced plastic paper,wherein the area-weight of the multi-layered damping layer is about 2.54kg/m².
 93. The multi-functional insulation according to claim 1, whereinwhen used for the end wall insulation of a motor space side furthercomprises:a dirt-resistant protective layer; the microporous stiffeninglayer being disposed between the porous resilient layer and thedirt-resistant protective layer and comprises a highly pressed fibrematerial with a thickness of about 2.5 mm and an area-weight of about1.0 kg/m² ; the dirt-resistant protective layer having a thickness of0.2 to 0.4 mm and an area-weight of 0.1 to 0.3 kg/m².
 94. Themulti-functional insulation according to claim 33 wherein adirt-resistant protective fleece is provided between the air layer andthe assembly package, said dirt-resistant protective fleece having anarea-weight of 0.05 kg/m² to 0.15 kg/m².
 95. The multi-functionalinsulation according to claim 33 wherein, between the air layer and theassembly package a foam damping layer having a thickness of 3.0 mm andan area-weight of about 0.12 kg/m² is provided.
 96. The multi-functionalinsulation according to claim 34 wherein a dirt-resistant protectivefleece is provided between the air layer and the assembly package, saiddirt-resistant protective fleece having an area-weight of 0.05 kg/m² to0.15 kg/m².
 97. The multi-functional insulation according to claim 34wherein, between the air layer and the assembly package a foam dampinglayer having a thickness of 3.0 mm and an area-weight of about 0.12kg/m² is provided.
 98. The assembly package according to claim 46,wherein the assembly package further comprises a layer selected from thegroup comprising a damping layer and an adhesive layer.
 99. The assemblypackage according to claim 98 wherein the assembly package furthercomprises a damping layer and an adhesive layer.
 100. The assemblypackage according to claim 45 wherein the microporous stiffening layerhas a total airflow resistance of R_(t) =900 Nsm⁻³ to R_(t) =2000 Nsm³,and an areal-mass of m_(F) =0.5 kg/m² to m_(F) =1.6 kg/m².
 101. Theassembly package according to claim 46 wherein the microporousstiffening layer has a bending stiffness of B=0.025 Nm to B=6.0 Nm.